python-requests 相当于curl的--data-binary？

Curl 可以选择按原样发送文件--数据二进制选项 http://curl.haxx.se/docs/manpage.html#--data-binary.

当测试时Qualys WAS API http://www.qualys.com/docs/WAS_API_User_Guide.pdf，以下curl命令有效：

curl -u "username:password" -H "content-type: text/xml" -X "POST" --data-binary @- "https://qualysapi.qualys.com/qps/rest/3.0/search/was/webapp" < post.xml

帖子.xml：

<ServiceRequest><filters><Criteria operator="CONTAINS" field="name">PB - </Criteria></filters></ServiceRequest>

使用 Python 的请求模块，我不断收到 HTTPError: 415 Client Error: Unsupported Media Type。

import requests
url = 'https://qualysapi.qualys.com/qps/rest/3.0/search/was/webapp'
payload = '<ServiceRequest><filters><Criteria operator="CONTAINS" field="name">PB - </Criteria></filters></ServiceRequest>'
headers = {'X-Requested-With': 'Python requests', 'Content-type': 'application/json'}
r = requests.post(url, data=payload, headers=headers, auth=('username', 'password'))

当尝试提交文件files参数时，也以415错误结束。

import requests
url = 'https://qualysapi.qualys.com/qps/rest/3.0/search/was/webapp'
payload = '<ServiceRequest><filters><Criteria operator="CONTAINS" field="name">PB - </Criteria></filters></ServiceRequest>'
headers = {'X-Requested-With': 'Python requests', 'Content-type': 'application/json'}
r = requests.post(url, data=payload, headers=headers, auth=('username', 'password'))

我设置这个的原因是为了将其合并到qualysapi Python 包 https://github.com/paragbaxi/qualysapi/.

原来我应该有的标题是

headers = {'X-Requested-With': 'Python requests', 'Content-type': 'text/xml'}